Portal vein resection in patients undergoing pancreatoduodenectomy for carcinoma of the pancreatic head. - Allema,J.H.; Reinders,M.E.; van Gulik,T.M.; van Leeuwen,D.J.; de Wit,L.Th.; Verbeek,P.CM.; Gouma,D.J. (Br J Surg, 1994)